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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Vishay General Semiconductor - Diodes Division SMAJ48-E3/5A

Name: SMAJ48-E3/5A
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMAJ48-E3/5A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMAJ48-E3/5A

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ48-E3/5A.pdf

Description:: TVS DIODE 48VWM 85.5VC DO214AC

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Product details

Overview

SMAJ48-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features 48 V stand-off voltage (V_WM), 85.5 V maximum clamping voltage (V_C) at 4.7 A peak pulse current (I_PPM), and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.

For engineers reviewing the SMAJ48-E3/5A datasheet, SMAJ48-E3/5A pinout, SMAJ48-E3/5A application, or SMAJ48-E3/5A equivalent, key selection criteria include its unidirectional polarity, 1.0 µA max reverse leakage at V_WM, 150 °C junction temperature rating, RoHS-compliant matte tin terminals, and compatibility with automated SMT placement on standard PCB copper pads.

Technical Context

This TVS diode operates as a voltage-clamping protection device that enters avalanche breakdown when transient voltage exceeds its 53.3–65.1 V breakdown range (V_BR at 1.0 mA). Its low incremental surge resistance ensures rapid energy diversion during ESD or lightning-induced surges.

The device uses a glass-passivated silicon junction and is rated for 40 A non-repetitive forward surge current (I_FSM) under 8.3 ms half-sine wave, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead) - enabling reliable operation on 5.0 × 5.0 mm copper pads per terminal.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 48 V nominal systems.
V_C @ I_PPM	85.5 V - Clamped voltage at 4.7 A peak pulse current; determines protected circuit's maximum transient exposure level.
P_PPM	400 W - Peak pulse power handling with 10/1000 µs waveform; supports robust surge immunity in industrial environments.
I_PPM	4.7 A - Peak pulse current capability at V_C; directly correlates to surge energy absorption (≈ 4.7 A × 85.5 V × 1000 µs ≈ 0.4 J).
T_J max.	150 °C - Maximum junction temperature; enables use in high-ambient-temperature applications like motor drives and power converters.
I_D @ V_WM	1.0 µA - Reverse leakage at stand-off voltage; ensures minimal standby power loss and signal integrity in low-current circuits.
Package	DO-214AC (SMA) - Standard surface-mount outline with cathode band marking; compatible with JEDEC MS-013 and IPC-7351B footprint.

Pinout & Package

DO-214AC (SMA) package: two-terminal surface-mount device with cathode band indicating the cathode terminal. Matte tin-plated leads meet J-STD-002 and JESD22-B102 solderability standards; MSL Level 1 per J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Positive reference terminal in unidirectional configuration	Connected to protected line (e.g., V_IN or signal); conducts during positive transients when cathode is held at higher potential.
Cathode (banded end)	Clamping reference terminal	Typically tied to ground or lower-potential rail; establishes clamping threshold relative to this node during overvoltage events.

Key Features

Feature	Design Value
400 W peak pulse power (10/1000 µs)	Enables protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without derating in standard layouts.
Low clamping ratio (V_C/V_WM = 1.78)	Minimizes stress on downstream components by limiting clamped voltage to <1.8× nominal system voltage.
Glass-passivated junction	Ensures stable electrical characteristics and long-term reliability under thermal cycling and humidity exposure.
RoHS-compliant, commercial-grade E3 suffix	Meets EU Directive 2002/95/EC; qualified for JESD201 Class 1A whisker resistance - suitable for consumer and industrial assembly.
MSL Level 1 moisture sensitivity	Allows unlimited floor life before reflow; eliminates bake requirements and simplifies SMT manufacturing flow.

Applications

Industrial Motor Drives	Automotive Body Control Modules
Use Scenario: Protection of gate drivers and microcontroller I/O pins against inductive kickback from relay and solenoid switching. IC Role / Device Role / Timing Role: Unidirectional TVS placed between MOSFET gate and source, clamping negative-going transients to prevent gate oxide damage. Use Value: Withstand 40 A surge current (I_FSM) and maintain V_C ≤ 85.5 V ensures gate driver ICs survive repeated 24 V system switching events.	Use Scenario: Safeguarding LIN bus transceivers and sensor inputs from load dump and jump-start transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Standoff-rated TVS on LIN data line, absorbing fast-rising spikes while preserving signal integrity below 48 V threshold. Use Value: 1.0 µA leakage at V_WM prevents bus loading; 85.5 V clamping protects transceivers rated for ≤ 60 V absolute maximum.
Telecom Power Supply Inputs	Industrial PLC Analog Input Channels
Use Scenario: Front-end surge suppression on 48 V DC input rails of PoE-powered switches and base station power modules. IC Role / Device Role / Timing Role: Primary clamping device across input capacitor, shunting lightning-induced surges before they reach DC-DC converters. Use Value: 400 W pulse rating and 120 °C/W R_θJA allow sustained operation on 5.0 × 5.0 mm pads without thermal runaway during repetitive surges.	Use Scenario: Overvoltage protection for 4–20 mA current loop receivers and precision ADC front-ends exposed to field wiring faults. IC Role / Device Role / Timing Role: Low-leakage TVS placed across differential input terminals, limiting fault voltage without distorting low-level analog signals. Use Value: Sub-µA leakage preserves measurement accuracy; 85.5 V clamping prevents latch-up in 24 V-powered instrumentation amplifiers.

Industrial Motor Drives

Automotive Body Control Modules

Use Scenario: Protection of gate drivers and microcontroller I/O pins against inductive kickback from relay and solenoid switching.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between MOSFET gate and source, clamping negative-going transients to prevent gate oxide damage.

Use Value: Withstand 40 A surge current (I_FSM) and maintain V_C ≤ 85.5 V ensures gate driver ICs survive repeated 24 V system switching events.

Use Scenario: Safeguarding LIN bus transceivers and sensor inputs from load dump and jump-start transients in 12 V vehicle subsystems.

IC Role / Device Role / Timing Role: Standoff-rated TVS on LIN data line, absorbing fast-rising spikes while preserving signal integrity below 48 V threshold.

Use Value: 1.0 µA leakage at V_WM prevents bus loading; 85.5 V clamping protects transceivers rated for ≤ 60 V absolute maximum.

Telecom Power Supply Inputs

Industrial PLC Analog Input Channels

Use Scenario: Front-end surge suppression on 48 V DC input rails of PoE-powered switches and base station power modules.

IC Role / Device Role / Timing Role: Primary clamping device across input capacitor, shunting lightning-induced surges before they reach DC-DC converters.

Use Value: 400 W pulse rating and 120 °C/W R_θJA allow sustained operation on 5.0 × 5.0 mm pads without thermal runaway during repetitive surges.

Use Scenario: Overvoltage protection for 4–20 mA current loop receivers and precision ADC front-ends exposed to field wiring faults.

IC Role / Device Role / Timing Role: Low-leakage TVS placed across differential input terminals, limiting fault voltage without distorting low-level analog signals.

Use Value: Sub-µA leakage preserves measurement accuracy; 85.5 V clamping prevents latch-up in 24 V-powered instrumentation amplifiers.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ48A-E3/5A	Lower V_BR range (53.3–58.9 V vs. 53.3–65.1 V); tighter 10% V_WM tolerance (48 V ±10% vs. ±10% but wider V_BR spread)	Better suited for precision 48 V systems requiring tighter clamping onset; slightly lower V_C (77.4 V)	Select SMAJ48A-E3/5A when design requires reduced clamping voltage and tighter V_BR consistency across production lots.
SMBJ48A-E3/52	Same V_WM/V_C specs but in larger DO-214AA (SMB) package; 600 W P_PPM rating; higher I_PPM (7.5 A)	Higher power handling and thermal mass; requires larger PCB footprint and different pad layout	Choose SMBJ48A-E3/52 only if surge duty cycle or energy levels exceed SMAJ48-E3/5A's 400 W capability - not a drop-in replacement.

Compared with SMAJ48-E3/5A, the SMAJ48A-E3/5A offers improved clamping predictability at the cost of reduced V_BR upper limit, while SMBJ48A-E3/52 trades board space for higher surge endurance - neither is pin-compatible, and both require layout revision.

Availability

SMAJ48-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power supply inputs, and PLC analog input channels requiring stable component supply and full traceability.

Supply support for SMAJ48-E3/5A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and manufacturability.

The SMAJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh industrial and automotive environments where consistent clamping performance and long-term stability are critical.

FAQ

What is the breakdown voltage range for SMAJ48-E3/5A?

The SMAJ48-E3/5A has a minimum breakdown voltage (V_BR) of 53.3 V and a maximum of 65.1 V at 1.0 mA test current, per Vishay Document 88390. This wide V_BR range reflects the inherent process variation of unidirectional TVS diodes and ensures guaranteed conduction above 48 V stand-off while accommodating manufacturing tolerances. The SMAJ48-E3/5A remains fully compliant with its 48 V V_WM rating across this span.

Is SMAJ48-E3/5A unidirectional or bidirectional?

SMAJ48-E3/5A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its single cathode band marking. It clamps only when the cathode is more positive than the anode - making it appropriate for DC power line and signal line protection where polarity is fixed. Bidirectional variants (e.g., SMAJ48CA) would lack polarity marking and clamp symmetrically in both directions.

What does the "E3/5A" suffix mean in SMAJ48-E3/5A?

The "E3" denotes RoHS-compliant, commercial-grade construction with JESD201 Class 1A whisker resistance; "5A" specifies the packaging format: 7500-unit quantity on 13-inch plastic tape and reel. This differs from "61" (1800 units on 7-inch reel) and "HE3" (automotive-grade AEC-Q101 qualification). The SMAJ48-E3/5A is not AEC-Q101 qualified - use SMAJ48AHE3/5A for automotive applications.

Can SMAJ48-E3/5A be used in place of SMAJ48A-E3/5A?

No - SMAJ48-E3/5A and SMAJ48A-E3/5A are not interchangeable without validation. While both share 48 V V_WM, the SMAJ48A-E3/5A has a tighter V_BR range (53.3–58.9 V) and lower clamping voltage (77.4 V vs. 85.5 V). Substituting SMAJ48-E3/5A may result in delayed clamping onset and higher stress on protected circuitry. Always verify transient response timing and clamping margin in the target application before substitution.

What is the maximum PCB pad size recommended for SMAJ48-E3/5A thermal performance?

Vishay specifies thermal ratings for SMAJ48-E3/5A based on mounting on 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal. Using smaller pads increases junction-to-ambient thermal resistance beyond the rated 120 °C/W, risking thermal runaway during repetitive surges. For optimal 400 W pulse handling, maintain minimum 5.0 × 5.0 mm Cu area per lead with internal thermal vias recommended for high-duty-cycle applications. The SMAJ48-E3/5A datasheet explicitly ties PPPM derating to this pad geometry.

SMAJ48-E3/5A Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-214AC, SMA

Series:: TransZorb®

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 48V

Voltage - Breakdown (Min):: 53.3V

Voltage - Clamping (Max) @ Ipp:: 85.5V

Current - Peak Pulse (10/1000µs):: 4.7A

Power - Peak Pulse:: 400W

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

SMAJ48-E3/5A FAQ

1.How can I place an order for SMAJ48-E3/5A through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ48-E3/5A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SMAJ48-E3/5A reliable?

The price and inventory of SMAJ48-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48-E3/5A is usually 5 days.

3.What payment methods are accepted for SMAJ48-E3/5A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48-E3/5A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ48-E3/5A?

SMAJ48-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ48-E3/5A order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SMAJ48-E3/5A?

For technical support, including SMAJ48-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48-E3/5A requirements.

6.How does Aetrix verify that SMAJ48-E3/5A is sourced from the original manufacturer or authorized distributors?

All SMAJ48-E3/5A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMAJ48-E3/5A meets industry standards.

7.What is the process for return or replacement of SMAJ48-E3/5A?

All SMAJ48-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48-E3/5A, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SMAJ48-E3/5A part is unused and in its original packaging.

Return procedure for SMAJ48-E3/5A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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